For security reasons you won't be able to change your registered email address.

If you want to change your registered email address then kindly get in touch with your school for this matter.

Your school will provide us with:-
1) Your name
2) Your current registered email address
3) Your new registered email address

After we update your registered email address we will send you an email to your new registered email and then you can log in to the shopping portal using your new email address.